Finishing-tool.



f. BAUMANN.

l FINISHING TOOL. APPLICATION FILED APR.8. |918.

Patented Apr. 15, 1919.

' 2 SHEETS-SHEET l F. BAUMANN.

FINISHING TOOL. APPLICATION man APR. s. 19u-a.

Patented APL-15,1919.

2 SHEETS-SHEET 2.

' mmmm ED sTATEs PATENT oEErcE.

FREDERICK BAUMANN, OF

PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, OF SEVEN vTHIIRTY-SEGONDS TO HIMSELF, SEVEN THIBTY-SECONDS TO NORMAN T. WHITAKER, 0F WASHINGTON, DISTRICT 0F COLUM- BIA, SEVEN THIRTY-SECONDS TO LEOPOLD BAUMANN, SR., 0F PHILADELPHIA,

PENNSYLVANIA, AND ELEVEN THIRTY-SECONDS T0 HERBERT WASHINGTON, DISTRICT OF COLUMBIA.

J'. BROWNE, 0F

EINISHING-TOOL.

Specification of Letters Patent.

Application led April 8, 1918. Serial No. 227,263.

To all'whom z't may concern v Be it known that I, FREDERICK BAUM'ANN, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and useful Improvements in Finishing-Tools, of which the lfollowing is a specification.

This invention relates to finishing tools and has particular reference to that class of nishing tools employed as a means for iinishing the bore of gun forgings although not restricted to such use.

In carrying out the present day practice of nishing the -bore of gun forgings it is customary to employ a wood bound reamer which consists of yan elongated flattened base, the width of which is substantially equal to the bore of the forging desired to be operated upon. This elongated base is provided with a pair of cutting elements which arev generally secured in position by means of suitable screws. A pair of semicylindrical soft wood mountings are secured to the elongated iiattened base, the grain of which wood bears a substantial parallel relation to the base carrying the mountings.

The above briefly described structure which is generally accepted as being the most eiicient and reliable of any heretofore known means for accomplishing the desired result has proved defective in manyparticulars.

The primary objects, among others, of my invention are to overcome the above referred objections and are as follows: l

To provide in a finishing tool a means whereby the tool may at all times maintain a common course of travel.

To provide in a finishing tool a means whereby the cuttings may be prevented from scarring or marring the wall of the bore.

To provide in a finishing tool a means whereby the cutting element may be easily and quickly adjusted to meet the requirements of a given size bore.

To provide in a finishin tool a novel means for securing the woo mountings in a correct osition with respect to the head carrying t e same.

- strong, durable,

To provide a finishing tool which may be used several times without materially alterinor changing any part thereof.

o provide a nishing tool which is simple in construction, cheap to manufacture and reliable, in operation.

'Other objects and'advantages of the invention will be apparent from the following description taken in connection with. the accompanying drawings. y

In the drawings, Vformin a part of this specification and in which li e numerals are employed to designate like parts throughout the same,

Figure 1 is a central horizontal longitudinal sectional view of a gun forging showing the same mounted within a lathe and as being operated upon by the device embodying my invention, the device embodying my invention being shown in top plan,

Fig. 2 is a sectional view taken on line 2-2 of Fig. 1, the device embodying my invention being shown in elevation and in t e act of being removed from the bore of the forging Fig. 3 is an enlarged detail'side elevation of the device embodying my invention,

Fig.: 4 is a longitudinal sectional view of Fig: 3 taken on line 4-4,

ig. 5 is a transverse sectional view of Fig. 3 taken on line 55,

Fig. 6 is a transverse sectional view of Fig. 3 taken on line 6 6, and,

Fi 7 is a detail sectional view taken on line -7 of Fig. 3.

In the drawings, preferred form of wherein is shown the my invention, the numeral'lO indicates a lathe having an adjustable carriage 11 mounted thereon, the carriage 11 being provided with the conventional form of adjustment means which comprises a screw indicated by the numeral 12. The lathe 10 is also provided with the conventional form of chuck 13 to which a forging such as a gun forging 14 isV adapted to be centrally secured.` Upon the lathe 10 substantially intermediate the carriage 11 and the chuck 13 there is mounted a suport 15 upon which one end of the gun forglng 14 is adapted to rest in order to maintain the axis of the forging 14 in true aline-f means of a set screw 19. The head 18 is with respect to the head 18.

vided with a 7 provided with a plurality of grooves 20. These grooves are adapted to receive therein tongues 21 carried by arcuate shaped segments of wood, which segments are indicated by the numeral 22. lt will be noted when considering Figs. 5, 6 and 7 that the grain of these segments is disposed radially This radial disposition of the grain in this particular position is of paramount importance. It is by this disposition that I am lenabled to overcome one of the objections heretofore found in the various types of finishing tool, the objection being an uneven diametrical expansion of` the wood mountings when they become dampened by the lubricant employed.v By disposin -the grain of these wooden segments ra ially with respect to the head 18 no radial expansion is caused. Should there be any circumferential expansion of these segments the expansion may be permitted without effecting .the line of travel of the tool due to the fact that the segments are adequately spaced from each ot er to allow anyfcircumferential expansion of the same. It will be noted when considering Figs. 5, 6 and 7 that due to the particular shape ofthe tongues and grooves shown I am enabled to securely retain the segments 22 in their respective positions upon the head 18 without any other fasten'- ing means. One end of the head 18 is proslot 23 as clearly shown in Fig. This slot is adapted to an elongatedprovided at its ends with cutting edges 25. It will be noted when-aonsidering Figs. 5, 6 and 7 that the length of the'cutting element 24 is substantially equal to the distance between the outer surfaces of any two of the oppositely means for retaining the cutting element 24 in position with respect to the head 18 there is provided Ia set screw 26 carried by the head 18 and radially disposed therein. To one end ofthe head 18 there is secured a pair of guides 27 by means of screws or the like indicated by the numerals28.- Through the outer ends of the guides 27 are passed a pair of lubricant carrying tubes 29, which tubes are arranged to deposit a supply of oil apertures 30 arranged within the. ends of the tubes. These tubes are adapted to be conreceive therein c cutting element 24 which is.

disposed segments 22. -As a nected with a suitable lubricant supply, not l shown, and are clamped to the shaft 16 by means of clamps 31 arranged at intervals as clearly shown in Figs.v 1 and 2.- To one side of the head 18 there is secured a suitable brush 32 in proximity to one of the cutting edges 25. This brush serves as a means for removing any particles of the cuttings which might adhere to the inner the n forging during the operation of the wall of finis ing tool and serves further as a means for moving such particles longitudinally along the bore of the gun forging as the tool continues to move longitudmally through the bore of the forging. The forward movement of the cuttings is accomplished by the brush 32 due to the fact that the same is set at a slight angle with respectto the head 1 8 as clearly shown in Fig. 4.

In use, the operalion'of the device is as follows: Assuming at the gun forging 14 is provided substantial'l bore and it is desired to lnish the bore accurately to a six `inch measurement, a cutting element 24 of suitable length is inserted into the slot 23 of a head 18 of a suitable size to be used to accomplish a' desired object.

s The head 18 is thenmoved into proximity with a six inch may be easily centeredwith respect to the bore of the forging. The cutting element 24 having been centered the set screw 26 is run down into engagement with the same and by means of the adjusting means 12 the head 18 together 'with the several elements carried thereby is moved into the bore of the forging, the forging being rotated by any suitable means. As the head 18 proceeds along its line of travel suitable lubricant is suppliedNto the cutting edges 25 throuh the supply pipes 29. Due to the fact t atthe segments 22 fit snugly within the bore the cuttings when removed are not permitted to enter between the wall of the ore and the outer face of the segments but on the other hand are either moved forward in front of the device by action of the brush 32 or collected between the segments 22 allowing the device to move unobstructed over the same. When the tool has .been

ore the same may be easily removed therefrom by reversing the adjusting means 12 in the usual manner. Should the segments 22 as a result of constant use become worn the tool as a whole may be placed in a turninglathe in order to turn olf a portion of the segments thereby the. tool which may e used again for a smaller bore in which instance a new cutting element 24 would be supplied, the length of which wouldv correspond to the distance between the outer faces of a air of oppositely disposed segments 22.y hould it4 become Aprolonging the life ofv necessary to sharpen the cuttin edges of the cutting element 24 these e ges may be ground, after which Agrinding the cuttin element 24 may be stretched to its origina length by slightly hammering the same substantially intermediate its ends.

It is to be understood that the form of my inventionherewith shown and described is to be taken as a referred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of theinvention or theJ scope of the subjoined claims.

Having thusdescribed my invention, what I claim as new ,and desire to secure and protect by LettersPatent of the United States, is:

1.- A finishing reamer comprising a head, a plurality of'wood segments having the grain thereof disposed radially with respect to said head, the wood segments being spaced from eachother, and a cutting element carried by said head.

2. A finishing reamer comprising a head, `a plurality of wood segments having the grain thereof disposed radially with respect to said head, the wod segments being arranged in rows, the rows'being spaced from each other, and a cutting element carried by said head. p

3. A inishing reamer comprising a head, provided with a plurality of grooves, a plurality of wood segments arranged within said grooves and having the grain thereof disposed radially 'with respect to said head,

,. the wood segments being spaced from each plthlr, and a cutting element r:arried by said 4. A finishing ,reamer comprising a head provided with a plurality of grooves, a plurality of wood segments arranged in rows within said grooves, the wood segments having the grain thereof disposed radially with respect to said head and spaced from each other, and a cutting element carried by said head.

FREDERICK BAUMANN. 

